Symbol reliability determination and symbol pre-selection based on reliability criteria

Abstract

A method and apparatus for processing demodulated data comprising received symbol data is disclosed. A decoder is used to compute estimated symbols and corresponding reliability metrics. The reliability metrics are transformed into reliability weights. Optionally, residuals relating to the difference between the received symbol data and the estimated symbols are computed. Output data are generated comprising any combination of the following: estimated symbols, reliability weights, residuals, and received symbol data. The residuals may be weighted by the reliability metrics and used by demodulation or error compensation loops to instantaneously reduce or increase the bandwidth of these loops.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is a Continuation-in-Part (CIP) of commonly-assigned U.S. application Ser. No.: 09 / 715,877, filed Nov. 17, 2000 now U.S. Pat. No. 6,795,512, entitled “SYSTEM FOR CARRIER PHASE TRACKING OF CODED SYMBOLS USING RELIABILITY METRICS FOR SYMBOL ESTIMATES”, hereby incorporated by reference herein for its teachings on symbol reliability and carrier phase tracking of coded symbols. This application claims the benefit of the priority filing date of U.S. application Ser. No.: 09 / 715,877 in accordance with 35 USC § 120. This application is also related to U.S. application Ser. No.: 09 / 729,652, filed Dec. 4, 2000, entitled “ITERATIVE CARRIER PHASE TRACKING SYSTEM”; and U.S. application Ser. No.: 09 / 738,896, filed Dec. 15, 2000, entitled “SYSTEM FOR CARRIER PHASE TRACKING OF MULTI-DIMENSIONAL CODED SYMBOLS”. Each of these applications is commonly owned by the assignee hereof, and each is hereby fully incorporated by reference herein as...

AI Technical Summary

Problems solved by technology

In this case the symbol error rates can become so large that the demodulation process is sever

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